fragment卡顿 的处理

 
FragmentManager fragmentManager=getSupportFragmentManager();
FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
fragmentTransaction.add(ViewId,fragment);// 或者fragmentTransaction.replace(ViewId,fragment);
fragmentTransaction.commit();
 
 
基础更好一点的同学会用show和hide方法
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.hide(new FirstFragment()).show(new SecondFragment())

//首先需要先实例好n个全局Fragment
 
//private  Fragment  currentFragment=new Fragment();（全局）
 
 
private  FragmentTransaction switchFragment(Fragment targetFragment) {
        FragmentTransaction transaction =getSupportFragmentManager().beginTransaction();
        //第一次使用switchFragment()时currentFragment null，所以要判断一下
        if (!targetFragment.isAdded()) {
            if (currentFragment != null) {
                transaction.hide(currentFragment);
            }
            transaction.add(R.id.fragment,targetFragment,targetFragment.getClass().getName());
        } else {
            transaction.hide(currentFragment).show(targetFragment);
        }
        currentFragment = targetFragment;
        return transaction;   
    }

在点击切换Fragment时：
 
 
@Override
public void onTabSelected(@IdRes int tabId) {
 
        if (tabId == R.id.tab_one){
 
            switchFragment(first).commit();
 
        }
        if (tabId == R.id.tab_two){
            switchFragment(second).commit();
        }
        if (tabId == R.id.tab_three){
            switchFragment(third).commit();
        }
}

//此方法在Fragment中
 
@Override public void onHiddenChanged(boolean hidden) {    
super.onHiddenChanged(hidden);    
if (hidden){
    //Fragment隐藏时调用    
}else {     
    //Fragment显示时调用   
}
}